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B
-4
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C
2
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D
-2
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Solution
The correct option is A 4 y=e−xcosxy1=−e−xsinx−e−xcosx=−e−xsinx−yy2=−e−xcosx+e−xsinx−y1⇒y2=−y−y1+e−xsinx⇒y2=−2(y+y1)⇒y3=−2(y1+y2)⇒y3=−2(e−xsinx−y)⇒y4=2y1−2y−2y−2y1ory4+4y=0⇒k=4